Answers
When changes occur to face environmental pressures, they must increase the individual's fitness to be favored by natural selection and result in adaptation. Between 1950 and 1980, individuals with half their bodies covered by plates decreased, while individuals with their whole bodies covered by plates increased.
How are adaptation and natural selection related?
Adaptations can be understood as the way in which different organisms manage to improve their fitness in the environment in which they live. To do it, they must adjust to the changes and selective pressures acting on them.
Adaptations involve changes and are usually related to mutations (let us remember that mutations are changes in DNA nucleotide sequences).
These changes must be beneficial for the individuals, meaning they must increase their fitness and make them more competitive.
If they do not increase their fitness (aptitude) they get lost.
If they increase the individual's fitness, they are selected by natural selection and transmitted through generations.
When natural selection favors a mutation, it sets it in the population and is inherited by the following generations. These mutations improve the individual's survival and reproductive rates. Hence, natural selection results in adaptation.
Image explanation
In the exposed example, we can see how the percentage of plates covering the animal's body changed through time.
At the beginning of the study (the year 1950), most animals had half of their bodies covered by plates (green bar), and only a few individuals had 2/3 bodies protected (orange bar).
As the lake changed its clarity, stickleback fishes with only half of their bodies protected got probably more exposed and easily seen by their predators. Their survival and reproductive rates decreased. From 1950 to the end of the study, their population size decreased significantly.
Predation acted as the environmental pressure. So the fish species needed to face this problem.
By 1960, a few individuals developed a new strategy. Their whole bodies were protected by plates (blue bar). This phenotype meant an increase in their survival and reproductive rates, so this strategy spread more in the population. Natural selection favored this change and set it.
By 1980 most individuals had their whole bodies protected by plates, and only a few of them still had half of their bodies covered. Since this turned out to be a beneficial change, population size started to recover.
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Related Questions
What happens during
facilitated diffusion?
A. Molecules are moved to an
unimportant area.
B. Molecules are destroyed.
C. Molecules are moved from a
higher concentration to a lower
concentration. This
Answers
Answer:
C. Molecules are moved from a higher concentration to a lower concentration.
Explanation:
Facilitated diffusion is a type of diffusion in which molecules move from a region of higher concentration to a region of lower concentration assisted by a carrier.
Why is water considered a good insulator?
Answers
Answer:
Water is a good insulator
Explanation:
This is because water is very healthy for our body making us not dehydrate
Which of the following DNA analysis techniques requires the most steps to complete?
STR profiling
SNP analysis
Y-STR analysis
DNA fingerprinting
Answers
The DNA analysis technique that requires the most steps to complete is DNA fingerprinting (Option D) The DNA fingerprinting takes 8 steps to complete.
What is DNA fingerprinting?DNA fingerprinting is a technique for identifying an individual from a DNA sample by examining distinctive patterns in their DNA.
The steps involved in DNA fingerprinting are as follows: The DNA is being isolated. The DNA is digested using restriction endonuclease enzymes. Electrophoresis is used to separate digested fragments based on fragment size.
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Match each part of the cell with its function.
cell wall
cell membrane
cytoplasm
ribosome
fills the cell and protects the structures
inside it
produces proteins
gives the cell its shape
separates the inside of a cell from the
environment
Answers
Cell wall = gives the cell its shape
Cytoplasm = fills the cell and protects the structure inside it
Ribosome = produces proteins
Which is one way that waves erode coastlines?
Back-and-forth movement loosens sediment and rock.
Large rocks are picked up and deposited in new areas.
Continuous impacts build up sediment and rock.
Loose sediment is picked up and blown to other locations. pls help
Answers
The option that is one way that waves erode coastlines is option A.) back-and-forth movement loosens sediment and rock.
What causes wave erosion?The main factors that cause sea wave erosion are hydraulic pressure, the force of waves hitting the beach, and the abrasion of sand and stones stirred up by the water constantly.
Note that a vibration is the back-and-forth motion of an object. Energy is carried through vibrations. A vibration is the back-and-forth motion of an object.
Hence, Sediments from cliffs and shorelines are eroded by waves. Ocean water's sediment functions as sandpaper. They degrade the shoreline over time. More erosion is brought on by larger waves and more sediment carried by them.
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Answer: a. Back-and-forth movement loosens sediment and rock.
Explanation:
If pH affects enzyme activity, then...
Answers
pH: Each enzyme has an optimum pH range. Changing the pH outside of this range will slow enzyme activity. Extreme pH values can cause enzymes to denature. Enzyme concentration: Increasing enzyme concentration will speed up the reaction, as long as there is substrate available to bind to.
Answer:
7>ph<14
Explanation:
if ph is 7 then its neutral, if ph lower than 7 and higher than 0 its acidic, if it's higher than 7 and lower than 14 its basic.
List the steps of the Krebs cycle and the products it creates.
Answers
Answer:
Step 1: Condensation of acetyl CoA with oxaloacetate.
Step 2: Isomerization of citrate into isocitrate.
Step 3: Oxidative decarboxylations of isocitrate.
Step 4: Oxidative decarboxylation of α-ketoglutarate.
The Krebs cycle results in the production of one FADH2, two NADH, two carbon dioxide molecules, and one ATP/GTP.
Explanation:
What evidence does the author provide to support the claim that genetic engineering has led to the advancement of
medical science?
OA. Genetic engineering involves processes such as genetic fusion that can be used to engineer the human gene
structure of cells, thereby creating improved or more advanced organisms.
B.
Genetic engineering alters the existing gene structure of an organism to create a new organism or to improve
certain chacteristics of the organism to improve its functioning.
OC. Genetic engineering allows for the production of genetically modified organisms (GMO), such as the first ever
type of insulin-producing bacteria that functions on a newer and improved level than the existing organism.
D. Genetic engineering allows scientists to artificially enhance genetic structure and holds the potential to cure
deadly diseases in humans that have no known cure.
Answers
The author provide evidence to support the claim that genetic engineering is Genetic engineering alters the existing gene structure of an organism to create a new organism or to improve certain characteristics of the organism.
Genetic engineering, also referred to as genetic alteration, is a process that uses technologies created in laboratories to change an organism's DNA. This could have adding new DNA, deleting a segment of DNA, or changing a single base pair (A-T or C-G).
Among other things, genetic engineering has been utilized in science and industry to create cancer therapies, brewing yeasts, and genetically modified plants and animals. As a component of GM technology, DNA is put into the genome of an organism. To produce a GM plant, new DNA is inserted into plant cells.
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Which statement describes the cyclic nature of seafloor spreading?
A. Continents are created
B. New oceanic crust is created
C. Volcanoes erupt and remove crust
D. The old crust gets thicker at subduction zones
Please hurry i have 10 minutes left
Answers
Answer:
volcanoes erupt and remove crust
Answer: the answer is C. Volcanoes erupt and remove crust
Explanation: I got it right on edge 2021
Use friction, deformation, air pressure and force in a sentence
Answers
Pressure builds up whenever there is friction and air. And if both are present, it deforms the set. In order for friction to work, pressure and air both are important.
What is friction, deformation, air pressure and force?
Friction: the force that resists against the relative layers of liquids, solids and other materials as they slide over each other.
Deformation: It is the continuous mechanical transformation of a body from a reference configuration to its current configuration. A configuration is a set containing the positions of all particles in a body.
Air pressure: The force exerted by compressed or free air on a surface it comes in contact with.
Force: Influences that can change the movement of an object. A force can change the velocity of an object with mass, i.e. accelerate it.
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Which statement is true regarding a chemical reaction? (1 point)
O The total number of atoms does not change, so mass is conserved in the reaction.
O The total number of atoms changes, so mass is conserved in the reaction.
O Even if the total number of atoms does not change, mass may not be conserved in the reaction.
O Even if the total number of atoms changes, mass may not be conserved in the reaction..
Answers
Answer:B) The total number of atoms does not change, so mass is conserved in the reaction.
Explanation:According to the Law of Conservation of Mass, no matter can ever be created or destroyed. The number of atoms does not change, thus the mass does not change.
i need help with 4d & 4e please! it’s due tmr
Answers
Denaturation of protein is the phenomenon where all the structures of proteins are disrupted except the primary structure. This happens because the primary structure is made up of covalent bonds that cannot be broken down easily. But the secondary or tertiary structures are made of non-covalent structures that are relatively easier to disrupt.
Enzymes are the proteinaceous agents that alter the rate of reactions. The enzyme activity is active when the protein exhibits the tertiary or quaternary structure. This is the reason why when protein denatures the enzyme activity also changes.
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A river with large, smooth rocks on the bottom, small and medium sized sediment is moving downstream.
Which conditions resulted in the erosion of larger rocks, like the one circled in the image? Check all that apply.
Answers
low gradient, high volume
high gradient, low velocity
high gradient, high velocity
What is Erosion ?
Erosion is the geological technique wherein earthen substances are worn away and transported with the aid of using herbal forces together with wind or water. A comparable technique, weathering, breaks down or dissolves rock, however does now no longer contain movement. Erosion is the alternative of deposition, the geological technique wherein earthen substances are deposited, or constructed up, on a landform. Most erosion is accomplished with the aid of using liquid water, wind, or ice (commonly with inside the shape of a glacier). If the wind is dusty, or water or glacial ice is muddy, erosion is taking area. The brown colour suggests that bits of rock and soil are suspended with inside the fluid (air or water) and being transported from one area to another. Physical Erosion - Physical erosion describes the technique of rocks converting their bodily houses with out converting their simple chemical composition.
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Deforestation has removed many habitats for bats. This action has impacted
which nutrient cycle the most?
Hydrologic cycle
Sulfur cycle
Nitrogen cycle
Phosphorous cycle
Carbon cycle
Answers
Deforestation has removed many habitats for bats this action has impacted nutrient cycle the most is hydrologic cycle
Deforestation refer to the decreases in forest area across the world that are lost for others uses such as agricultural croplands, urbanization or mining activities and greatly accelerated by human activities and a nutrient cycle is a repeated pathway of particular nutrient or element from the environment through one or more organism and back to the environment and deforestation can disrupt the water cycle by decreasing precipitation which can lead to change in river flow and water volume
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Do you think the unofficial titles of some eras (i.e., Age of Fishes, Age of Reptiles,
Age of Mammals) are informative or an oversimplification? Explain your reasoning.
with alternative unofficial titles based on what you have learned about
Come up
each era
Answers
The unofficial titles of some eras such as Age of Fishes, Age of Reptiles and Age of Mammals are really informative and they are not oversimplifications because these periods reflect the emergence of different taxonomic groups in the course of evolution.
What are animal eras?The animal eras are periods during the geological time in which certain groups of animals appeared in the course of evolution, which results informative to determine how evolution (change) occurred due to natural selection.
For example, mammals emerged as a taxonomic group during the Cenozoic Era, which occurred approximately 65 million years ago and this period is known as the Age of mammals.
Therefore, with this data, we can see that an animal era is not only an oversimplified term because it also involves the emergence of certain taxonomic groups during the evolution and can serve to contextualize geological periods in a biological framework.
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Name the three most common
prokaryotic shapes?
A. bacteria, archaea, and protists
B. cocci, bacilli, and spirilla this
C. Neither of these
Answers
Answer: B. Cocci, Bacilli, and Spirilla
Explanation:
Define the word scavenger.
Answers
Explanation:
1. an animal that feeds on carrion, dead plant material, or refuse.
2. a person who searches for and collects discarded items.
Identify and define the anther, stigma, style, filament, pistil, petal, stamen, ovary, sepal, and ovule
Answers
A: Ovule: Ovule is that part of the plant which forms the seed of flowering plant when fertilized.
B: Ovary: The ductless reproductive gland is known as the ovary. It houses a large number of ovules. It is the part of plant where seed formation takes place.
C: Style: The stalk that joins the stigma and the ovary is long and slender, like a tube called style.
D: Stigma: The receptive tip at the top of each carpel in the gynoecium of a flower.
E: Pistil: The female reproductive organ of a flower, the pistil is located inside and is made up of three parts: the stigma, style, and ovary. The term "pistil" refers to all of this.
F: Anther: It is a yellow, sac-like structure. The pollen is placed and stored in the anther.
G: Stamen: Also referred to as an androecium, this is the male reproductive component. It is made up of : filaments and anthers.
H: Filament: It is a thin, threadlike structure that supports the anther.
I: Sepal: The green portion that lies under the petals and shields developing buds is known as a sepal.
J: Petal: Petals are a modified version of leaves that are brightly colored to attract insects for pollination. Petals also protect the flower's reproductive parts.
What are the different components of a flower?
The Vegetative components of flower are: Petals and Sepals.The Reproductive components of flower are:Stamen, Anther, Filament, Pistil, Stigma, Style, Ovary.
How does flowers reproduce?
Flowers are a plant's reproductive organs that participate in sexual reproduction. It contains the female reproductive organ known as a gynoecium and the male reproductive organ known as an androecium. Through pollination, the androecium's pollen grains are delivered to the gynoecium's stigma. The male gametes are transferred from the pollen grain to the female gamete that is already present in the ovary through the pollen tube as it grows and develops. The zygote is created when the male and female gametes combine. The ovules become seeds, and the ovary becomes fruit. When these seeds are spread in the soil, they germinate and produce new plants.
Therefore, A, B, C, D, E, F, G, H, I and J are Ovule, Ovary, Style, Stigma, Pistil, Anther, Stamen, Filament, Sepal and Petal, respectively.
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what is name of the new island off iceland that has begun succesion since 1963?
Answers
Answer: Surtsey
Explanation:
Surtsey is a new island formed by volcanic eruptions in 1963-67.
What is the shape of the typical Elodea cell?
Answers
Rectangular shape
Claim:The survival trait became common in the bed bug population because their immune system got used to the chemicals causing them to mutate in order to survive.
What would be the evidence to support this.
Answers
The evidence that would support the claim the survival trait became common in the bed bug population because their immune system got used to the chemicals causing them to mutate in order to survive is the change in the allele frequency for the mutated gene variant in the population across generations.
What is a genetic mutation?A genetic mutation can be defined as any alteration in the genetic material of an organism that may be associated with a change in the phenotype when this mutation affects a gene that encodes for such trait.
A mutation may be beneficial, deleterious or neutral depending on the resulting phenotype and it may produce a positive change in the allele frequency in the case of positive germinal mutations.
Therefore, with this data, we can see that a genetic mutation may be beneficial and it may lead to a positive change in the allele frequency when it is a germinal beneficial mutation.
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Which of the following questions is most relevant to understanding the Calvin cycle?
(A) How does chlorophyll capture light?
(B) How is ATP used in the formation of carbohydrates?
(C) How is NADP+ reduced to NADPH?
(D) How is ATP produced in chemiosmosis?
Answers
How is ATP used in the formation of carbohydrates? is the most relevant question to understanding the Calvin cycle.
The Calvin cycle is a procedure that vegetation and algae use to show carbon dioxide from the air into sugar, the meals autotrophs want to grow. Every dwelling aspect on Earth relies upon at the Calvin cycle. Plants rely upon the Calvin cycle for strength and meals.
So to discover whether or not the calvin cycle is taking place, you need to see whether or not sugar or glucose is being synthesized or being created, so you are searching out is glucose being prete.
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The most observed human variations
changes gradually rather than having
discrete boundaries as expected-This
gradual change is referred to as a?
A. Cine
B. Slow change
C. Gradient
D. Clinal
Answers
The most common human variants are those that vary gradually instead of having defined boundaries as would be expected as cine
The correct answer is A
Is a gradual transition preferable?For issues that don't call for irregular change and that can be improved continuously and sustainably, gradual change is an more stable method. When there is divided government, modest, incremental adjustments are frequently the only way any change could take place.
What exactly is gradual change?Instead of happening all at once, a progressive process or change happens in little increments over time. A steady, sluggish procedure is required to lose weight. Synonyms include steady, even, sluggish, and regular Alternative Words for gradual
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A. without/not this
B. study of
C. life/living
What does the
prefix "a-" mean,
as in abiotic?
Answers
Abiotic is a prefix that often means "not, without." Abiotic is etymologically defined as "removed from everything related to life," much as amoral is defined as "lacking in morals."
What are abiotic factors?An ecosystem's non-living components that influence its surroundings are known as abiotic factors. Examples in a terrestrial ecology can include heat, light, and water. Salinity and ocean currents are examples of abiotic elements in a marine ecosystem.
The interaction of biotic and abiotic elements results in a special ecosystem.
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Answer:
a) without/not this
Explanation:
The prefix "a-" in abiotic means as "without/not this". Abiotic organisms are non-living components. Therefore, the option (a) is the correct answer.
These are the events that occur during protein synthesis. They are not in the correct order. Write numbers in the blanks indicating the order in which these steps occur.
Answers
1. DNA transcribes RNA
2. The RNA is sent to the cytoplasm in the form of mRNA
3. mRNA attaches to a ribosome
4. As the mRNA moves through the ribosomes, a tRNA molecule arrives transporting the correct amino acid
5. Newly arriving amino acids are connected to the growing polypeptide by peptide bonds
6. When a stop codon is reached, the protein is released from the ribosome.
What environment would be least likely to rapidly grow bacteria and why?
Answers
The environment least likely to rapidly grow bacteria is a classroom desktop, option 3 because it is dry and mostly clean and not as conducive a place for bacteria which thrive in warm, moist, protein-rich environments.
How and where do bacteria thrive?Bacteria live in both hot and cold temperate environments than humans but they thrive more in warm, moist, protein-rich environments with an acidic pH. They can survive and adapt to extreme temperature regions too.
Bacteria can be found in water, swamps, soil, plants, animal, waste and so on. They strive in stratospheres of 6 and 30 miles into the atmosphere and ocean depths.
This is the full question:
What environment would be least likely to grow bacteria and why? Here are your choices:
1. The armpit of a human
2. A warm freshwater mud puddle
3. A classroom desktop
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Suppose you were observing an organism through the microscope and noticed that it moved toward the bottom of the slide and then it moved to the right. What does this tell you about the actual movement is the organism?
Answers
Answer: top of the slide and to the left
Explanation:
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Plants (such as the trees
shown in this image) that
continue to grow year after
year without dying fall into
which of these categories
of angiosperms?
A. millennials
B. annuals
C. perennials this is answer
Answers
Answer:
perennials
Explanation:
Plants that persist for many growing seasons. Generally, the top portion of the plant dies back each winter and regrows the following spring from the same root system (e.g. Purple Coneflower). Many perennial plants do keep their leaves year-round and offer attractive borders and groundcover (e.g. Tickseed, Shasta, and Ox-Eyed Daisy).
Answer: C. perennials this is answer
Which geographic distribution is
the most common form and occurs
when individuals are located
around resources in large groups?
A. migratory
B. uniform
C. clustered
D. random
Answers
Expiation uniforms help tell each group apart
in a developing embryo, what process allows cells of the mesoderm to give rise to muscle bone, and heart tissue
Answers
Answer:
cell differentiation
Explanation:
occurs during week 3 of human development. The process of gastrulation generates the three primary germ layers (ectoderm, endoderm, mesoderm), which primes the system for organogenesis and is one of the most critical steps of developments
